Hacksaw machine



June 17, 1952 G. s. LODWICK J HACKSAW MACHINE Fild May 10, 1948 4 Sheets-Sheet l mvk GLJladzvick INVENTOR ATTORNEYS.

June 17, 1952 a. s. LODWICK HACKSAW MACHINE 4 Sheets-Sheet 2 Filed May 10, 1948 6.,51L0dl0i6k' INVENTOR ATTORNEYS.

June 17, 1952 G. s. LODWICK HACKSAW MACHINE 4 Sheets-Sheet 5 7 Filed May 10, 1948 Q.,S.L0dmick INVENTOR ATTORNEYS.

4 Sheets-Sheet 4' Filed May 10 1948 INVENTOR;

ATTORNEYS- -dr v naq ack.sawama hin tak f m t y n- Lin Patented June 17, 1952 iizjeoonfs v IHAIQVJKSIAW M 261k1111 1113.v *sj'niiawick, Misfit, rbwa Application May 10, unseen anytime,-

a iThiswinvention"relate nto an; i mpifoye .haok saw machine, for more accurate cuttingof round barsandtubingm, Wen bm'ect .of the. invention. is to v o i eie .improvedi form, of motor driven; back saw. machine. I ailAnothenobjectof the in entionis to provide an improved-motor. driven. reciprocating saw blade hackrsawmachine. H u A rAjiurtheii-oobiect of the. inv nt n his t ,PIQ' ride animproyedmotordriven; hack saw machine which will support. the. work to be cut npon a pair of rollers which willwrotate the work as the sewing; operation is carried on,

s'tillvfurther object. of the, invention isto provide an improvedmotor driven hack saw machine which;willusupport the work upon a pair /of rollers for rotating the; work as the sawing "operation. is carried on,. and a; cooperating; pres,- sure roller for" contacting .the work. for firmly holdingthe same upon thev supporting rollers. U Another, objecto lof. the invention is to provide an ,improvedaformrof-motor, driven hack saw machine .which will rotate the work asit is being cut, ..and;ifurther means for limiting the depth of; the sawrcut and-for preventing the saw from operating below a desired; level. v p

Another objectofthe invention is to provide an improved motor driven hackflsaw machine ,whichmwillflbel highly efiicient in ,oper-ation,,. and .-relatively inexpensive to manufacture andpro- ..l..;Other objects will appear as the description proceeds. H l .H A. a, I ilnathelaccompanying drawings which form a partaof thisiapplication:r t l Figural isna side. elevation of the improved motor driven hack saw machine.

Bier a s de elevationoi e mprov d moto posite side as shown in Fig. l. t

Fig;.; 3 is a plan-il z e l.of the improved motor riv 'ha k aw mach ne-r. a a H i 1 i F1 n enla d. deta l s e e ev tiono .het op ratedwo .supporting rollersiw vian orl: piecasupportedit ereon. jg 5;,isfa sectional, view taken ondthe line 5-5 of Fig. 1.

;. .i iai is nen1areed..detai1,side elevation of the. meaning n .l ccentrie means for, raising the saw blade on itsnbackward, stroke. a i isa f ront;; levation of, the gearing and lti(itiillitlliii-means 101' raising the saw blade on its baekwardstrokeh .7

Fig. 8:: is a perspective view of the worken- 5 use in cnttirigprdetermined ler'i'g'thsoffni'a- 25 ,and 26. are snpported, by: the brackets fo limin o t Pi e "o "Work 'Jdi'sp ed Like characters of reference, are 'use itnr'oi h"- ,out the following specification Iidtliej part ing drawing to designate rorfesponding parts.

in 'earr 'infg nut the invention, there is r 'vided a bench seem 'I having downwar ly and outwardly extending legs 2. and, 3 at opbos 'te'endis, t

At. t an ,r r .l x' 'ndine wo iipi'zio ti l roller '4 'is supported'infixedfpositioniiip the ppor-t laby means offtlie 'bra t h beiiehj i pifi jti o er aif' lx. exten ne si i g n z l r not In s "supporte in, age g ide plate o. same ibeneh suppa 1, ar a ';a crank: n nme l 2 [is rovided for. the enter? n'dlof hel q wiia .i 1, l. I 1

R t h L I! a 'efsecnreii i to an'end {of each-work supporting roller 4 dQI; and brackets we -grown i mandate 4:. re linsan b tt tt t h n means of the depending arnisliafid IS and- 06nee ner a ore mlt An; L shaped pawl actuating arm. 0] supports 1; wit ad pan eingresilientlyjorced into engagement with sa1d '.ratchets '13 and [4 by means 'of the coil voted checking or reverse movemen page longitudinal nave-'- ploTn the "Work; supporting rollers faftns ningar fisz s'ecuredfto the pivot rodjill will be resi ier tly urged downwardly by means of the tensioning arm 32 and to the leg 2. The peripheral upstanding fianges 34 on the roller 29 will seat in the annular slot formed in the work 28 made by the reciprocating hack saw blade 35 as the work 28 is rotated by means of the ratchets l3 and I4 and their cooperating pivoted pawls 2| and 22.

An upwardly extending angularly disposed metal supporting strip 36 is welded at 31 to the end of the guide or base plate H, and-slidably and adjustably supports the carriage 38 which includes the oppositely disposed bracket arms 39 between which a pressure roller 48 is rotatably mounted for contacting the top surface of the work 28. An adjusting screw 4| is threaded through a nut 42 at the upper end of the strip 36 and is threadably engaged with the carriage 38, whereby when the hand crank 43 on the outer and upper end of the screw 4| is rotated, the roller 49 will be positively moved toward or away from the work 28. One end of the roller 49 will be formed with a peripheral flange 44 and a peripheral slot 45, the upper edge of the saw blade 35 being adapted to ride in the slot 45 to hold it in firm contact with the work 28 during the sawing operation, and to prevent endwise movement of the work 28.

A supporting post 46 is fixed in vertical position upon the end of the bench support I, and pivotally supports :the inverted L-shaped saw frame supporting head 41 upon the pivot pin or bolt 48.

A U-shape bracket 49 is secured to the outer end of the head 41 and supports the vertically spaced parallel outwardly extending saw bearing uide rods 50 and l.

The stop arm 52 is supported by the post 46 and is engageable by the adjusting screw 53 carried by the head 41 for selectively limiting the downward cutting limit of the saw blade 35.

An inverted U-shape saw frame 54 is provided with transversely spaced upper and lower bearing loops 55 and 56 slidably and reciprocably mounted upon the bearing guide rods 50 and 5|. The saw blade 35 is supported upon the pin 51 at its inner end with its outer end being supported upon the pin 58 carried by the lever 59 pivoted at 60 to the outer depending arm of the saw frame 54. A keeper member 6| pivoted at 62 upon the saw frame 54 for positioning about the upper end of the lever 59 to hold the saw blade 35 rigid in the frame 54.

An arm 63 is secured to the post 46 and supports the upwardly extending angle piece or arm 84, through which the adjusting screw 65 is mounted, being held by the nut 66. A coil spring 61 is mounted between the screw 65 and the head 41 urging the saw frame upwardly on its inward stroke while the ratchets l3 and I4 are rotating the work 28.

The driving means for the hack saw machine includes an electric motor 68 which is supported upon the shelf 69 secured between the legs 3 of the bench support I, and an electric conductor will be connected between the motor 68 and a source of electric current supply (not shown). A pulley H on the motor shaft 72 is connected by the bolt 13 to a larger pulley 14 on one end of the shaft 15. A small gear 16 on the opposite end of the shaft meshes with a large gear 11 on the end of shaft 18, and a small gear 19 is fixed on the opposite end of the shaft 18. The small gear I9 meshes with a larger gear 88 mounted on the shaft 8| disposed between the yoke 82 secured to one side of the supporting post 86.

The crank arm 83 is fixed to the shaft 8I' to which the gear 89 is fixed, and the outer end of the arm 83 is pivotally connected to the connecting rod 84, whose opposite end is adjustably and pivotally attached to the L-shape ratchet supporting and operating arm 20, whereby the ratchets 2| and 22 rotate the work supporting rollers 4 and l to rotate the work 28 as the saw 35 and saw frame 54 are moved upwardly from the work 28 on their inward strokes. The lower end of the arm 63 is formed with a rounded end for engagement with the eccentrics 85 secured on the shaft 19 to provide for the raising of the saw blade 35 and the saw frame 54 between the cutting strokes of the saw blade 35.

An eccentric pin 86 is supported on the large gear 18 and is connected by the connecting rod 81 with the ear 88 welded at 89 to the saw frame 54 for reciprocating the same as the electric motor 68 is operated.

From the foregoing description it will be apparent that either tubular or round work 28 may be firmly supported upon the rollers 4 and 1 and held by the upper roller 49, and that the work will be held from longitudinal shifting as the sawing operation is carried on, due to the flanges 34 and 44 which ride in the slot in the work 28 made by the saw blade 35 as the work is rotated by means of the ratchets l3 and I4 and pawls 2| and 22. Also, the distance of cut away may be limited or set by means of the screw 53.

As shown by Fig. 9 of the drawings, I have provided an attachment which may be mounted on the bench support I, the attachment embodying the supporting rod 90 that extends through the openings 9| and 92 formed in the bench support, the rod being secured within the openings. This rod 99 extends an appreciable distance beyond the side of the bench support I where it provides a support for the securing block 93 which is provided with an opening to receive the rod 90, the securing block being clamped to the rod 98 .by means of the bolt 94. Thi securing block is also provided with a bore in which the arm I5 is secured, the arm 95 having a head 96 which is formed with a threaded opening to receive the threaded shank 91 of the stop or gauge. The means for holding the arm 95 on the securing block, permits the arm 95 to be moved to various positions to support the member 91 directly opposite to the end of the rod being cut, to hold the rod which is moved into engagement therewith, to a predetermined position where it may be cut by the saw. With this device it is obvious that a number of rods may be accurately cut to predetermined lengths, the operator merely sliding. one end of the rod, which in the present showing is indicated by the reference character A, into contact with the member 91.

While the preferred embodiment of the instant invention has been illustrated and described, it will be understood that it is not intended to limit the scope of the invention thereto, as many minor changes in detail of construction maybe resorted to without departure from the spirit 0f the invention. I

Havin thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a cylindrical work clamp for hack saw machines, a bench, a pair of spaced horizontal supportin rollers mounted on the bench, means for adjusting one of said rollers with respect to the other roller providing a support between which the work is held, a work engaging roller mounted above the supporting rollers adapted to rest on the work at the top thereof, manually adjustable means for directing pressure against the work engaging roller, feeding the work engaging roller to the work, and ratchet means for simultaneously rotating said work supporting roller and work resting thereon.

2. In a work clamp for power hack saw machines, a bench, a pair of horizontally spaced supporting rollers mounted on the bench, ratchet teeth formed on the ends of the supporting rollers, a pawl actuating arm pivotally mounted on the bench under the supporting rollers, pawls mounted on the pawl actuating arm engaging said ratchet teeth whereby movement of said pawlactuating arm rotates the supporting roller and work resting thereon, an inclined supporting strip secured to the bench extending above the supporting rollers, a carriage movable on said work supporting strip, a pressure roller mounted on the carriage resting on the work, an adjustable screw mounted on said supporting strip connected with the carriage, adapted to force the carriage and pressure roller towards the work during sawing of the work.

3. In a work clamp for power hack saw machines, a bench, a pair of spaced horizontal supporting rollers, mounted on the bench, between which tubular work being sawed is supported,

means for rotating the supporting rollers rotating the work, an upper pressure roller engaging the work above the supporting rollers, means for adjusting the upper pressure roller towards and away from the work, a roller having an annular flange operating under the work, and said flange moving in the saw cut in the work, holding the work" against lateral movement on the bench.

GWYLIM S. LODWICK.

REFERENCES CITED The following references are of record in the file of this patent:

, UNITED STATES PATENTS Number 

